WordPress gallery – image title

Hi,

I am using default WordPress Gallery and I want to show title above image only if it is filled with some title. Otherwise it shouldn’t be visible. Because if no title is filled it shows image name and it looks ugly and distracting for visitors. Is there some way to do this? Some PHP code to functions or anything at all? Thank you for any ideas, tips or links. I was searching for this issue more than hour on Google and I found no solutions.